紫外光引发模板聚合阳离子聚丙烯酰胺及其污泥脱水应用

发布时间：2018-06-09 03:43

本文选题：模板聚合 + 阳离子聚丙烯酰胺　；参考：《光谱学与光谱分析》2017年08期

【摘要】：阳离子聚丙烯酰胺是污水和污泥处理中常用的一种絮凝剂,传统方法制备的阳离子聚丙烯酰胺因阳离子单体随机分布,电荷过于分散,导致其在絮凝时不能充分发挥阳离子单体的电中和作用,为此本研究尝试使用一种新型方法制备阳离子聚丙烯酰胺,即以二甲基二烯丙基氯化铵(DMDAAC)和丙烯酰胺(AM)为单体,分别以两种不同分子量的聚丙烯酸钠(PAAS)为模板,使用紫外光引发模板聚合法制得模板聚合物TPDA1和TPDA2,同时使用紫外光引发聚合法制得非模板聚合物(NTPDA)作为对比。使用红外光谱(FTIR)、氢核磁共振图谱(1 H NMR)、扫描电镜(SEM)等方法对制得的聚合物进行表征,并通过污泥脱水试验研究其污泥脱水效率。波谱分析结果表明,添加模板提高了DMDAAC单体的活性,促使聚合物分子中形成DMDAAC连续分布的阳离子单体嵌段结构,从而提高了聚合物的絮凝性能,尤其是电中和作用;SEM扫描显示模板聚合物的具有较大的比表面积和分形维数;污泥脱水试验表明,模板聚合物具有较好的污泥脱水性能和较宽pH应用条件,当模板聚合物TPDA1投加量为50mg·L-1,污泥pH为8时,其具有最佳污泥脱水效率,污泥含水率降至最低值72.5%。模板分子量对聚合物属性也存在影响,分子量较低的模板制得的聚合物具有相对较好的污泥脱水效率。
[Abstract]:Cationic polyacrylamide is a kind of flocculant commonly used in sewage and sludge treatment. The cationic polyacrylamide prepared by traditional method is too dispersed because of the random distribution of cationic monomer. Therefore, cationic polyacrylamide was prepared by a new method, that is, dimethyldiallylammonium chloride (DMDAAC) and acrylamide amylase (AM) as monomers. The template polymers TPDA1 and TPDA2 were obtained by UV induced template polymerization using two different molecular weight sodium polyacrylate (PAASA) as templates, and the non-template polymer (NTPDAs) was obtained by UV initiation polymerization as a comparison. The polymer was characterized by FTIR, 1H NMR and SEM, and the sludge dewatering efficiency was studied by sludge dewatering test. The results of spectral analysis show that the addition of template can improve the activity of DMDAAC monomer and promote the formation of a continuous distributed cationic monomer block structure of DMDAAC in the polymer molecule, thus improving the flocculation performance of the polymer. In particular, SEM scanning shows that the template polymer has a larger specific surface area and fractal dimension, and the sludge dewatering test shows that the template polymer has better sludge dewatering performance and wider pH application conditions. When the dosage of template polymer TPDA1 is 50mg L-1 and the sludge pH is 8, it has the best sludge dewatering efficiency, and the sludge moisture content decreases to the lowest value 72.5. Template molecular weight also affects the properties of polymer. The polymer prepared by template with lower molecular weight has better sludge dewatering efficiency.
【作者单位】：重庆大学三峡库区生态环境教育部重点实验室;宜宾学院资源与环境工程学院;重庆大学低碳绿色建筑国际联合研究中心;宜宾市辐射环境监测站;
【基金】：国家自然科学基金项目(21477010) 发酵资源与应用四川省高校重点实验室(2009KFJ002)资助
【分类号】：TQ317;X703

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